Trimmer mechanism



- Patented June l4,l 1929.

' U-NITED, STA-T Es rrxrsrn" OFFICE.

HENRY J. EBERIIAE'DT, on NEWARK, NEW JERSEY, AssIerNon, EYMESNE ASSIGN- nEN'rs, 'ro WEsTINGHoUsE ELECTRIC a MANUFACTURING COMPANY, n CoEroEA- 'ran/INEE MECHANISII.

Application led Hay 6;

My invention relates to trimming'v mech-` comprises mounting the grinding wlieel,'

spindle andbea-rings in a removable bearing block that may be mounted in a trimming machine for trimming the wheels to a desired contour .and that may be transferred to a gear-wheel grinding machine as a unit,

supply of trimmed wheels that may be readily mounted on. a'grinding machine.

Another' obj ect of my invention is to pro.- vide a wheel-trimming device for shaping the sides and periphery of a grinding wheel to be used for nish grinding the sides of adjacent gear teeth.

Heretofore, various types of trimmer mechanisms have been utilized for trimming abrasive wheels employed for grinding 'gear teeth, which functioned by means of the engagement with a cam member of a guide mechanism embodying several co-operating parts for imparting al compound motion to the trimming member. Mechanisms of this character involved an indirect functioning of the guide templet that resulted in inaccuracies.

My prese-nt invention is directed to a device for trimming gear-grinding wheels that is adapted to trim both sides of the grinding wheel simultaneously to contours identical with the contour of a single guiding template.

In thel accompanying drawings, Fig. 1 is a view in perspective of a trimming machine embodying my invention;

Fig'. 2 is a plan view of the trimming machineof Fig. 1; i e

Fig. 3 is. aplan view of the base of the. trimming` machine with the trimming slides and connecting gear wheels in place;

thereby making it possible to maintain al 1926. serial. No. 107,102.

thetrinimerslide of Fig. 3.

i Referring toi` the drawings, the trimmer elevation andjendelevation, respectively, of

Figs. 4, 5 and 6 are views in plan, sidel l mechanism comprises a base 1', trimming 'means 2 slidably mounted on the baser 1, a movable bed member V8, also slidably mounted 'on the base 1 and having mounted thereon a grinding unit 4, a motor 5, and a template6."

The trimming means 2 comprises trimming slides 7 and-8 having rack teeth 9, that are slidably mounted in ways 10 in the base l. Gear wheels 11 mounted on studs 12 engage the `rack teeth 9 and each other for `interlocking the two slides 7 and 8..- A

plate 13 is secured to the base 1 by cap n screws 14 for"retaining the'slides 7 and 8 and the gear wheels 11 in proper relation to one another an'd for protecting them from injury. '1

The plate 13 may be adjustedl by means of the tapered wedge 15 tol compensate for wearing of the plate or slides. A gui'de'pin.

16 is provided in the trimmer slideI 8 for engagement with the template 6 and a spring 17 is secured to the trimmer slide 7 for biasing it to the left, as seen in Fig. 2. The force oi the spring 17 is transmitted through the gear wheels 11 to the slide 8, biasing it to the right and maintaining theguide pin 16 in engagement with the template 6 thereby taking up all lost motion between the operating parts in one direction.

The template 6 is mounted lon a slide 18 that is secured to the bed member 3 by means of guides 19 and 21. -An adjusting screw' 22 is journaled in the bed member 3 and has threaded engagement with the lslide 18 for adjust-ing its position and that of the template 6 relative to the bed member The `bed member 3 is provided with a groove 23 for slidably engaging the` tongue 24 on the basel.

A screw 25'provided with a hand wheel 26 isjournaled in the base 1 parallel to and centrally disposed with respect to the tongue 24v and has threaded engagement with a nut 27 on the bed member 3. The grinding unit 4 comprises a bearing block 28 having a tongue 29' for engaging 4a, groove 31 in the bed member 3 at substantially right angles i to the groove'23. A 'stop 32 is Vprovided on the bed member 3 Jfor engaging a lug 33 o n the v,bearing block 28 to accurately locate the blo/ek 28 transversely with respect to the bed Amember 3. Bearingsl 34 are providedat either end of the bearing block 28 for supporting a spindle 35.

The spindle 35 hasmountedv at oneend 'a belt pulley 36 and at the other end, a

grinding Wheel 37. "The grinding wheel 37 is mounted upon a bushing 38 that is scv. cured to the spindle 35 by means of the nut 39. A ring 4l is provided in the bearing l block 28 toefacilitate the removal of lthe grinding un'it 4 from the trimming mech- -anism. The driving motor 5 is mounted 'upon a plate 42 on the bed member 3 Iand is tongue 48 ,for co-operating with the groove 44is slidably mounted upon the trimmer slide-8. An adjusting screw 49 is threaded into the platel46 and passes through a hole 51 in an elevated portion 52 of the slide 8.

Nuts 53 are threaded on the adjusting screw 49 on either side of the elevated position 52 to adjust the longitudinal position of the plate 46 with respect to the slide 8.

A bracket member 54 having an integral lug 55 is mounted upon the plate 46 and se- -cured thereto and to the slide 8 by a bolt 56 vthat extends from the T-slot through holes 57 in the plate 46 and the bracket mem'- ber 54 and by a bolt 58 that extends from the other Ts1'ot'45 through a hole 59 in the plate l46 and a slot 61 in the bracket member 54. A tool-holding block 62 is pivoted onA the raised portion63 of the bracket 54 by a vpivot pin 64 and is held in position bya cap screw 65A that asses through a slotted opening 66 in the block 62 and is threaded into the portion 63 of the bracket 54. An adjusting screw 67 is threaded in a hole 68 in the block 62 and bearsupon the bracket member 54 for angularly adjusting-the block 62 aboutl an axis throughthe pin 64. Y `A set screw 69 is threaded in the portion 63 of the bracket 54- for restraining the block 62 frolnplockwise rotation as viewed in Fig. 5.` AngularJ adjustment of the bracket 54 about the bolt 56 may-be' secured by loosening the bolts 56 and 58 and turning the. bracket 54'by means of set screws71 that are. threaded in the brackets 47 and engage the lug member 55. A diamond-holder 72' is supported in 'a hole 73 in the block 62 and retainedin position by the set screws 74.

Af periphery trimmer is slidably mounted 1n a groove 7 6 in ,the plate 13 and may-be actuated parallel to the spindlek 35 by means of the hand lever 77. f A diamondgauge83 that-is supported by the diamond' holding bracket 78, is placed position between the diamond holders 72 and diamond points 84, carried by the holders 72, are adjusted to their proper Working position by manipulating the plates` 46, lthe brackets 54 and the blocks 62, as heretofore described to of the gauge 83. The gauge 83 is then rel moved and the periphery-trimn'ling diamond .holder 8l secured in the bracket 78 and adjusted -to its proper position.

After theadjustments are completechthe motor 5 is energized and the Wheel 37 to be trimmed is rotated at a moderate speed. The hand wheel 26 is then revolved to bring the wheel 37 to be trimmed toward the trimming diamonds 84. lAs the wheel 37 and the bed member 3 are drawn toward the trimming diamonds, the template 6 is drawn past the guide pin 16 and the spring 17 draws the trimming diamonds 84 apart by reason of its action upon the trimmer slides 7 and8 through the cooperating gear Wheels 11. v

curves on each side of the wheel 37 that are vexactly identical in form and size to the curve on the template 6. The slide 18 may -85 .bring the points'84 in contact with the edge The trimming diamonds 84 thus trace out be adjusted by means of the adjusting screw 22 to feed the cutting diamonds 84 into'engagement with the wheel 37, as Ysuccessive reciprocations are given to the bed member 3 by means of the hand wheel 26.

ALight'successive cuts are taken from the surface'of the Wheel 37'until it is brought to the desired thickness.,4 The slide 18 and the .template 6 are then Withdrawn toward the front of 'the machine by means of the A adjustingscrew 22 to allow the cutting diaperiphery trimmer diamond 81 and reduced to the proper diameter Jby oscillating the v-monds 84 to separate. The vgheel 37 may then be' brought into engagement with theqzg hand lever 77 to' takeV successive cuts fromv Y' rthe vsur-face of the wheel parallel -to the. spindle 35. The wheel 37 and bushing 38 may then' be removed from the vspindle 35 Y by first removing-the nut39. Or, the entire grinding unit 4 may be,v removed from Hthe groove 31 inthe bed member 3 with the aid j Another Wheel 37 or complete grinding unit l is then put into place and the operation repeated. l l

From the foregoing description, it is obv ioiis that lmy invention provides a grinding-Wheel trimming mechanism that is ca-4 pable of rapidly and accurately forming both sides of a grinding' Wheelto contours identical with that of the template used and that by utilizing my invention, a supply of accurately trimmed Wheels may be kept at hand for use on a grinding machine so that `very little time Wil'l be lost by the grinding machine operator in replacing the grinding wheels. This method also allows one operator to become especially skilled in trimming the grinding Wheels and allows another op-.

erator to become especially skilled in. using the trimmed Wheels in a gear-grinding or other grinding machine;

Although I have described a specific embodiment of my invention, it'will be obvious to those skilled in the art that various modifications may be made in the design and the wheels meshing with the rack slides and with eacli other, means on one rack slide for engaging the template and trimming means mounted on the rack slides.

2. In a Wheel'trimming machine, a support for trimming means comprising a slide member, a bracket member mounted on the slide member and angularly adjustable Withrespect thereto, a ,trimmer supporting block mounted on the bracket and angularly adjustable in a plane at an angle to the bracket adjustment plane.

3. In. aftrimming machine for grindingV Wheels, asupporting base, a bed member slidably mounted thereon, a spindle for ro-- tatably supporting a Wheel to be trimmed mounted on the bed member at substantially right angles to its direction of'motion, a.

slide mounted on the bed member and adjustable parallel yto its direction of motion,

a templet mounted on the slide,two trimmer slides having rack teeth mounted on thel base, gear Wheels for interlocking the trimmer slides, a guide member on one trimmer slide for co-operating with the template, resilient means for holding the guide member in engagement with the template and trimming means mounted on the trimmer slides.I

4;. In a trimming machine for` grinding Wheels a supporting base, a bed member slidably mounted thereon, a spindle forrotatably supporting a Wheel to. be trimmed mounted on the bed member at substantially right angles to its direction of motion,

a slide mounted on the bed member and aolj ustable parallelto its direction of motion, a templet mounted on the slide, two trimmer slides having Vrack teeth mounted on the base, gear Wheels for interlocking the trimmer slides, trimming means mounted on the trimmer slides, a guide member on one trimmer slide for co-operating with thetemplate and means on the other trimmer slide for biasing the guide member into engagement with the template.

5. In a trimming machine for grinding Wheels, in combination, a sup orting base, a bed member slidably mounted) onthe base, means mounted on the bed member for rotatably suppoiting a Wheel to be trimmed,

a slide adjustably mounted on the bed member, a template mounted onl the slide, two trimmer sliders having rack. teeth mounted in Ways on the base, a plurality of gearr wheels for engaging the rack teeth to co` operatively connect the trimmer slides, trimming means for engaging the Wheel to be trimmed mounted on the trimmer slides, a guide member on one of vthe trimmer slides for cooperating with the templateto guide the trimmer slides to properly tr-imn the Wheel and resilient means for holding. the guide members in engagement With the template.

f.` In a trimming machine for grinding Wheels, in combination, a supporting base,

a bed member slidably mounted on the base, means on `the bed member for rotatably supporting a Wheel to be trimmed, a plurality of slide members mounted in converging Ways in the base, trimming means mounted thereon, rack/ teeth on the slide members, gear Wheels for engaging the rack teeth to interconnect the slide members, 'landmeans on the bed member for actuating the slides to trim the Wheel to theidesired contour.

. In' testimony whereof, I have hereunto subscribed my name this 15th day of April, 1,926. y

HENRY J'. EBERHARDT. 

